Output filename from a parameter in macro

[3doptics]

I have been running a simulation, which produces an output file in every event. The file name (e.g., ‘Event_1.txt’) is determined in BeginOfEventAction() using the event ID, and writing on the file happens in EndOfEventAction().

Now I am trying to run many simulations for different parameters, which are iterated in a macro (e.g., /control/loop sub.mac pos 0 100 10). I am hoping to save the output files for each parameter in a different folder or to modify the file name by including the parameter (e.g., ‘Pos_0_Event_1.txt’).

Any suggestions will be deeply appreciated. Thank you.

[mkelsey]

Add a G4String parameter to your EventAction with the name prefix you want. Add a Messenger class (e.g., G4GenericMessenger) to your EventAction with a UI command to set the parameter.

Assuming that your /control/loop happens after /run/initialize, then you can put the extra macro command into your sub.mac, something like
/3doptics/setPrefix Pos_{pos}, before calling /run/beamOn.

Rather than a bazillion tiny plain text files, have you considered using a single N-tuple, and doing the splitting and analysis separately? You could then include the position value, along with the eventID, as N-tuple columns.

[3doptics]

Thank you so much! It works like a charm.

Also, thank you for the idea! It’s a bit over my head now, but I’ll definitely try it when I become more familiar with the Geant4 function structure.